Wikipedia is the 8th most visited website globally. It is a free, openly editable encyclopedia written collaboratively by volunteers around the world. With over 2 million articles in English and over 250 languages, Wikipedia has grown exponentially since its creation in 2001. It relies on volunteer contributions and uses the MediaWiki software to allow easy editing and collaboration between contributors.

1. The Wikipedia
Dr. Luis Ibanez, Kitware
http://creativecommons.org/licenses/by/3.0/

2. © 2007 Luis Ibanez
● This presentation is Copyrighted by Luis Ibanez
● This presentation is distributed under the
Creative Commons Attribution License 3.0:
http://creativecommons.org/licenses/by/3.0/
● You are free to Reuse
● You are free to Remix
● Provided that you give credit to the author
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3. This presentation was created using
Open Source Software
Open Office copyright is jointly held by Sun
Microsystems and Contributors.
The software is distributed under the
GNU Lesser General Public License Version 2.1.
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4. There is Hope...
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5. Wikipedia
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6. Wikipedia
Wiki Encyclopedia
Wikipedia
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7. Wikipedia
● Yahoo
http://www.alexa.com/site/ds/top_500
● Google
● YouTube
● Windows Live
The 8th
● Facebook most visited
● Microsoft Network (MSN) web site
● Myspace
● Wikipedia
● Blogger Web 2.0
● Yahoo 7
http://meta.wikimedia.org/wiki/Wikipedia.org_is_more_popular_than...

8. Wikipedias
English Dutch
2,585,000 814,000
Articles Articles
French Polish
715,000 544,000
Articles Articles
Japanese Netherlands
527,000 8.29 Million Articles 374,000
Articles 253 Languages Articles
Italian Portuguese
505,000 434,000
Articles Articles
Spanish Swedish
407,000 294,000
Articles Articles
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http://meta.wikimedia.org/wiki/List_of_articles_every_Wikipedia_should_have

9. The Future of the WWW
...and non-commercial sites such
as the Wikipedia have pioneered
new collaborate styles of
information sharing.
Tim Berners-Lee
innovation will happen
provided it has a platform of open technical standards,
a flexible, scalable architecture, and access to these
standards on royalty-free ($0 fee patent licenses) terms.
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http://dig.csail.mit.edu/2007/03/01-ushouse-future-of-the-web.html

10. Wikipedia – Free Content
full-time staff
non-for-profit 2006 = 5
Wikimedia Foundation 2007 = 10
2008 = 19
Volunteers Collaborating
Some Language Versions English Version
carry full carries some
Free Content non Free Content
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http://en.wikipedia.org/wiki/Wikipedia_Foundation

11. Number of Contributors by Country
http://en.wikipedia.org/wiki/Image:English_Wikipedia_contributors_by_country.png
Permission is granted to copy, distribute and/or modify this document under the terms of the 11
GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation

12. Infrastructure
Tampa, Florida Seul Amsterdam
San Francisco
Dedicated clusters
of Linux Servers
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13. Infrastructure
● More than 400 servers
● 10 Billion pages per month (Average)
● 50,000 HTTP request per Second (Peak)
● Hardware budget: $ 1.5 M
● Bandwidth budget: $ 35 K
● IT Staff: 4 paid employees + 3 volunteers
● Migrated to Ubuntu (from mix Fedora + RedHat)
http://arstechnica.com/news.ars/post/20081009-wikipedia-adopts-ubuntu-for-its-server-infrastructure.html
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14. Infrastructure
http://meta.wikimedia.org/wiki/Wikimedia_servers
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15. MediaWiki
http://www.mediawiki.org/wiki/MediaWiki
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16. MediaWiki
● Written in PHP
● Built upon MySQL
● Licensed as GPL
● Page modifications are added to the database
● Easy page recovery in case of vandalism
● Manage image and media files
● Supports caching
● Coupled with Squid proxy server
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http://www.mediawiki.org/wiki/MediaWiki

17. Founders
Nupedia
● Larry Sanger
● Jimmy Wales
January 2001 Wiki as a
feeder
GNU Free Documentation
License
January 2003
Richard Stallman
Wikipedia
Wikipedia ® Trademark 2006
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18. Wikipedia Size
2 Million Articles in 2006
Yongle Encyclopedia (1407)
Record for 600 Years !!
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19. Wikipedia Size Comparison
Articles (K) Words (M) Characters (M) Words/art.
● Wikipedia 2,000 1,000 3,500 435
● Siku Quanshu - 800 -
● Yongle Encyclopedia - 370 / 770 -
● Enciclopedia Universal 1,000 200 1,000 -
● Gujin Tushu Jicheng - 100 -
● Encyclopedia of China 80 126 1,580
● Enciclopedia Italiana 60 50 247 833
● Nationalencyklopedin 183 - - -
● Encyclopaedia Britannica 120 55 300 370
● Great Soviet Encyclopedia 100 21 200 570
● Encyclopedie 72 20 - 278
● Microsoft Encarta 70 40 200 200
● Encyclopedia Americana 45 25 - 556
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http://en.wikipedia.org/wiki/Wikipedia:Size_comparisons

20. Number of Articles
http://en.wikipedia.org/wiki/Image:EnglishWikipediaArticleCountGraph_linear.png
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This file is licensed under the Creative Commons Attribution ShareAlike license versions 2.5, 2.0, and 1.0

21. Wikipedia Statistics (English Edition)
● 2 Million Articles
● 175 Million edits by users
– Average of 16 per page
● 5.7 Million registered users
● 1,390 Users have administrative tools
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22. Wikipedia Self-Healing
● Type Number Mean Median
● All content 618,502 22.3 days 90.5 min
● Mass delete 3,574 7.7 days 2.8 min
● MD Obscene 47 1.8 days 1.7 min
http://alumni.media.mit.edu/~fviegas/papers/history_flow.pdf
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23. Wikipedia - Essentials
● Wikipedia is not for sale.
● Non-for-profit.
● Free for everyone (learned from Free Software) GFDL
● 250 Languages (local chapters, volunteer translators)
● You can't change anything, only add to it. (MySQL)
● Quality Control: Editors
● Not an authoritative reference: (use critical thinking)
● Is a collection: contributions by unpaid volunteers
● For the long haul: at least 100 years from now. 23

24. Wikipedia - Open Nature
● Collaboration of volunteers
● Consensus over Credentials
● Susceptibility to Vandalism
● Capability for Self-correction
● As accurate as other Encyclopedias
● Peer-reviewed
● Attention to Copyright and proper Licensing
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25. Wikipedia Accuracy
“Internet encyclopaedias go head to head”
Jim Giles, Nature 438, 900 - 901 (2005).
● Entries on Science Topics were taken from
Wikipedia and Britannica.
● Sent to domain experts (on blind study)
● 42 Entries tested
– 4 Average errors in Wikipedia, 3 in Britannica
– 4 Serious errors in both Wikipedia and Britannica
– 162 factual errors in Wikipedia, 123 in Britannica
● (but Wikipedia articles are 2.6 longer than Britannica)
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26. Wikipedia - Images
● Image self-pages (author, copyright, license)
● Over 2.5 million images
● Anybody can upload more images
● Serious copyright management (GPL, CC licenses)
● Vector images and Audio recordings
● Most image are stored in Wikimedia Commons
● Avoid repeated uploads
● You can use (free) images in your own work
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27. Cultural Freedom
● The freedom
– To use the work and enjoy the benefits of using it
– To study the work and to apply knowledge
acquired from it
– To make and redistribute copies, in whole or in
part, of the information or expression
– To make changes and improvements, and to
distribute derivative works
● These freedoms should be available
to anyone, anywhere, anytime.
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http://freedomdefined.org/Definition

28. Users Access Levels
● Stewards
– Allow users to change rights of others
● Bureaucrats
– Create admins bots, move pages, rename users
● Admins
– Block users, delete pages and history, protect pages
rollback changes...
● Registered
– create articles, upload files, move articles
● All Users
– Create accounts, edit, read
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http://en.wikipedia.org/w/index.php?title=Wikipedia:User_access_levels&oldid=100160162

29. Wikipedia Fauna
● WikiElf
– Works behind the scenes, infrastructure maintenance
● WikiFairy
– Wiki editor who beautifies and standardize articles
● WikiGnome
– User who makes small incremental improvements
● WikiOgre
– Users who makes huge changes in articles.
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http://en.wikipedia.org/wiki/Category:Wikipedia_fauna

30. Wikipedia Fauna
● WikiGremlin
– Creature that runs a Wikipedia website
● WikiTroll
– Deliberate and intentional attempts to disrupt the
usability of Wikipedia
● WikiDragon
– Vast contributions. Creating entire articles.
– Bold edits
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http://en.wikipedia.org/wiki/Category:Wikipedia_fauna

31. Wikipedia Special Forces
● Counter-Vandalism Unit
● New Pages Patrol
● Recent Changes Patrol
● Random Page Patrol
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32. Wikipedia Sister Projects
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33. Wikimedia Commons
● Media Repository
● Maintained by volunteers
● Material reusable across Wikipedias
● Freely licensed material
– Photographs, diagrams, animations, music, spoken
text, video clips...
● Mayflower (image search engine)
● 2.6 Million pages, 2 Million media files
http://commons.wikimedia.org/wiki/Main_Page 33
http://en.wikipedia.org/wiki/Wikimedia_Commons

34. Wikisource
● Online Library of free content publications
– Public domain, or
– Freely available licenses
● Historical Documents
● Translations
● Examples
– Bible, Tao Te Ching, Britannica 1911, Jules Verne,
Grimm's Brothers Fairy Tales, Allan Poe.
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http://en.wikisource.org/wiki/Main_Page

35. Wikiquotes
● Free online compendium of Quotations
● 16,271 pages so far
● Categories
– People
– Proverbs
– Films
– TV shows
– Literary works
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http://en.wikiquote.org/wiki/Main_Page

36. Wikinews
● Free content news source Wiki
● Every story is written as a News reports
(as opposed to an Article in the Wikipedia)
● Neutral Point of View Policy
● Started on December 2004
● By September 2007 it has 10,000 news articles
● Beyond Texts: Audio, Video
● Credibility Question
– (but you can trust cable news... isn't it ?)
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http://en.wikipedia.org/wiki/Wikinews

37. Wiktionary
● Free content Dictionary
● Available in 150 Languages
● Written collaboratively by Volunteers
● Wikisaurus (synonyms)
● Started on December 2002
● November 2006
– 1.7 Million entries in 171 languges
● Many of the entries are created by “bots”
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http://en.wikipedia.org/wiki/Wiktionary

38. Wiktionary – Growth per Language
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http://en.wikipedia.org/wiki/Image:Wiktionary_growth.png

39. Wikiversity
● Free Learning Materials
● Five Languages
– English, French, German, Italian, Spanish
● Host scholarly projects and communities
● Concept of “University of the World”
● Doesn't confer Titles (Degrees)
● Learning, Teaching and Researching
http://en.wikipedia.org/wiki/Wikiversity
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http://en.wikiversity.org/wiki/Wikiversity:What_is_Wikiversity%3F

40. Wikispecies
● Free content catalog of all species
● Aimed at scientists
● Started in August 2004
● Growth
– by Oct 2006 it reached 75,000 articles
– by May 2007 it reached 100,000 articles
– by Sep 2008 it reached 150,000 articles
● Support for Taxonomy relationships
● Avoids duplication with Wikipedia
http://en.wikipedia.org/wiki/Wikispecies
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http://species.wikimedia.org/wiki/Main_Page

41. Wikimedia - Meta-Wiki
● Coordination of all the
Wikimedia Foundation Projects
● Administration
● Discussion about new and ongoing projects
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http://meta.wikimedia.org/wiki/Main_Page

42. Wikibooks
● Collection of Free Textbooks
● Books directly written by contributors
● Self-publishing
● Started on July 2003
● Content available for continuous peer-review
● Anybody can edit them an improve them
● English version has 30,100 Modules
http://en.wikipedia.org/wiki/Wikibooks 42

43. Wikibooks - Growth
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http://en.wikipedia.org/wiki/Image:Wikibooks_growth.png

44. End
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